import secrets
from pathlib import Path

import typer
import yaml

from src.commands.utils import CONSOLE
from src.config import GENERATED_STACK_PREFIX, Config, InfraConfig, S3Config

app = typer.Typer()


@app.command()
def init(
    output: str = typer.Option("config.yaml", help="Destination path for the config file"),
    force: bool = typer.Option(False, "--force", "-f", help="Overwrite an existing config file"),
) -> None:
    """Write a starter config.yaml to the current directory."""
    dest = Path(output)
    if dest.exists() and not force:
        CONSOLE.print(f"[yellow]{dest} already exists.[/yellow] Use --force to overwrite.")
        raise typer.Exit(1)

    config = _new_isolated_config()
    dest.parent.mkdir(parents=True, exist_ok=True)
    config_data = config.model_dump(mode="json")
    config_data["sagemaker"].pop("role_name", None)
    with open(dest, "w") as f:
        yaml.safe_dump(config_data, f, sort_keys=False)

    CONSOLE.print(f"[green]✓[/green] Config written to [bold]{dest}[/bold]")
    CONSOLE.print("Edit [cyan]sagemaker.training.image_uri[/cyan] before running training commands.")


def _new_isolated_config() -> Config:
    suffix = secrets.token_hex(6)
    namespace = f"{GENERATED_STACK_PREFIX}{suffix}"
    config = Config(infra=InfraConfig(stack_name=namespace))
    config.s3 = S3Config(bucket=f"{namespace}-data")
    return config